[tahoe-lafs-trac-stream] [Tahoe-LAFS] #4059: bump subunitreporter to 23.8.0

[Tahoe-LAFS]

#4059: bump subunitreporter to 23.8.0
---------------------+---------------------------
 Reporter:  exarkun  |          Owner:
     Type:  defect   |         Status:  new
 Priority:  normal   |      Milestone:  undecided
Component:  unknown  |        Version:  n/a
 Keywords:           |  Launchpad Bug:
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 23.8.0 includes a fixed for unicode handling that mainly affects Windows
 and causes problems with collecting test results on the Windows jobs being
 moved to CircleCI.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4059>
Tahoe-LAFS <https://Tahoe-LAFS.org>
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